Latheritup introduced a new formula for their body wash. They want to conduct an experiment to compare skin cleanliness of people using the new formula and current formula. Information on the sixteen volunteers is shown in the table.

Volunteer Gender Age, year Female 24 2 Male 35 3 Female 32 4 Female 44 Male 22 6 Male 42 7 Male 56 8 Male 39 9 Female 56 10 Female 20 11 Male 26 12 Female 34 13 Male 44 14 Female 52 15 Male 51 16 Female 47